For me the keyword is 'overkill, but for a purpose. What 2 GPUs can do for graphics-demanding titles like the Crysis/Metro series - to run them smoothly at 60 fps at max detail - they are overkill for other mainstream titles like the COD/MOH/BF etc series. Other less demanding mainstream titles, you won't even need to check their minimum/recommended specs anymore. If you play games w/o AA then 2 GPUs would be even more overkill. In the long run, what you gain is your rig will be able to play almost all mainstream games at max detail, and for a longer period of time. But if all you play are non-graphics demanding games then 2 GPUs is a waste of money. But as Heng mentioned, be mindful that power & heat will be an issue when you intro 2 GPUs into your rig. In other words, some of your other PC components will also need to be overkill, esp your PSU. I have 9 fans inside my casing and even so I hit 80C under load.